Malicious PDF — malware analysis report

Static analysis result for SHA-256 3633cc8bdd706a87…

MALICIOUS

PDF

87.7 KB Created: 2021-03-14 23:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08891bfdff6d26922f31e213da8dbc82 SHA-1: 5269b5f37854c5baae3b88ea3f211696796a181d SHA-256: 3633cc8bdd706a87031f28d18f3ef23063fc579daa332cfce0fa36344b03c463
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/wix?keyword=warren+wiersbe+genesis+pdf PDF link annotation
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/650615.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/excel_macros_online_tutorial.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/xowakopalegitazoriloto.pdfIn PDF document text
    • http://gareduli.22web.org/wowolepatatejalak.pdfIn PDF document text
    • http://vofufime.mypressonline.com/21618247509.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/vetisaf.pdfIn PDF document text
    • http://stavki-na-sport.site/119283156479lj60.pdfIn PDF document text
    • http://smallita.space/367652351523uu5s.pdfIn PDF document text
    • https://boriduleloson.weebly.com/uploads/1/3/4/0/134012687/0d177a.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/061aa280a39f.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/b._f_skinner_operant_conditioning.pdfIn PDF document text
    • http://s7hmus.org/xusijerumuxiv4ug13.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/structures_or_why_things_dont_fall_down.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/analytical_chemistry_christian_6th_edition.pdfIn PDF document text
    • http://instacopyrightcenter.com/how_do_i_recover_my_facebook_email_addresslehzq.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/fcdcea7da68b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/the_lightning_thief_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf368c6-9674-4d4d-a4af-9b9dc04d6784/delta_contractor_table_saw_replacement_fence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1912aff8-0d17-4323-8705-6c16875536ea/how_to_build_a_easy_bat_house.pdfIn PDF document text
    • http://vugoban.epizy.com/10149289624.pdfIn PDF document text
    • http://vojapulipono.epizy.com/consumer_reports_best_used_cars_for_seniors.pdfIn PDF document text
    • http://judutuv.epizy.com/taxizasefigagoluz.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/zenubidiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/875a5b4a-28d9-4f9f-b7bb-6b50d408f1b2/vurixerazimosi.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/how_to_check_number_of_day_trades_on_td_ameritrade_app.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 5420 bytes
SHA-256: c24e458de14e3403bd21f80e6d1033fb407d128862ed1d8b80ef968ff7290e52
font_01_sfnt_off00012b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 10732 bytes
SHA-256: c08865be3e55ec0986b0f7d6a94c4a3807492546eaa8136df6ad079d64dcdb04